I thought - I need to read a poem, because  I can't remember how they are written. What do people write them about? How do they begin? I resolved to write a poem like the first one I found on my bedside table, and it was this:

http://www.vqronline.org/articles/1996/spring/catullus-alberto-caeiro-fernando/

- or at least, the 'dirty unknown child' section. That is difficult, because it is close to what I saw today.